标准编号：ISO/TR 9272:2005
中文名称：橡胶与橡胶制品 试验方法标准精度的测定
英文名称：Rubber and rubber products — Determination of precision for test method standards
发布日期：2005-07
标准范围
This Technical Report presents guidelines for determining, by means of interlaboratory test programmes(ITPs), precision for test method standards used in the rubber manufacturing and the carbon black industries.It uses the basic one-way analysis of variance calculation algorithms of ISO 5725 and as many of the termsand definitions of ISO 5725 as possible that do not conflict with the past history and procedures for precisiondetermination in these two industries. Although bias is not determined in this Technical Report, it is anessential concept in understanding precision determination. The ISO 5725 concepts of accuracy and truenessare not determined in this Technical Report.Two precision determination methods are given that are described as “robust” statistical procedures thatattempt to eliminate or substantially decrease the influence of outliers. The first is a “level 1 precision” procedure intended for all test methods in the rubber manufacturing industry and the second is a specificvariation of the general precision procedure, designated “level 2 precision”, that applies to carbon black testing.Both of these use the same uniform level experimental design and the Mandel h and k statistics to review theprecision database for potential outliers. However, they use slight modifications in the procedure for rejectingincompatible data values as outliers. The “level 2 precision” procedure is specific as to the number ofreplicates per database cell or material-laboratory combination.
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